feat(omp): survive a full session kill by reading omp's own transcripts

Claude conversations survive "Kill Tmux & Claude" because Codeman reads
them back independently from ~/.claude/projects, not from its own
session bookkeeping. omp conversations had no equivalent: kill the
Codeman session and the conversation vanished from Past Sessions
entirely, even though omp itself never forgot it on disk.

Adds omp-transcript.ts, a scanner over omp's own
~/.omp/agent/sessions/<mangled-cwd>/<uuid>.jsonl files (the same shape
as Claude Code's own transcript scanner, but simpler -- these files are
small enough to read whole instead of doing head/tail windows). Each
file's own "session" header line carries the real cwd and session id
directly, so unlike Claude's mangled-directory-name decoding this
never has to guess. Wired into gatherUnifiedInputs() as a second
history source alongside the Claude scan, and HistoryInput/
mergeUnifiedSessions() now carry an optional `mode` so a non-claude
history-only row still gets a real mode badge.

Also fixes the ambiguity behind the "continue picks the wrong
conversation" report from this session's testing: omp mints its OWN
session uuid, unrelated to Codeman's, so a live/persisted row and its
own history-scan row would otherwise show up as two separate entries
for the same conversation the moment the id gets resolved. Reuses the
existing claudeSessionId alias field (mergeUnifiedSessions' fold-into-
owner mechanism) to point at the resolved omp id, threading it through
every place `_claudeSessionId` gets (re)computed -- the constructor,
_resolvedOmpRespawnConfig, and a new _maybeCaptureOmpSessionId() that
opportunistically resolves it the first time a brand-new omp session
(one that has never gone through a respawn) goes idle.

Also closes a THIRD instance of the "ompConfig never got wired in
here" gap this session kept finding: restoreMuxSessions() in server.ts
restores every sibling CLI's config from persisted state on boot except
omp's, so a boot-recovered omp session always lost its resolved resume
id and fell back to guessing again.

Verified live end-to-end: told a session a secret, killed it fully
(Kill Tmux equivalent, killMux=true -- the Codeman session AND its tmux
pane both gone), and the conversation still showed up in the unified
list as a history-sourced row with the real first prompt as its title
and an omp mode badge, keyed by omp's own session id.

Known remaining gap, not fixed here: the claudeSessionId alias doesn't
yet resolve reliably on every boot-recovery path for a session that
was never respawned while alive (e.g. a plain re-attach to a pane that
was never dead) -- worth a follow-up, but doesn't affect the two things
that matter most: the conversation surviving a kill, and continuation
correctness once an id has been resolved (which happens on the very
next respawn either way).

src/omp-transcript.ts

@@ -0,0 +1,172 @@
+/**
+ * @fileoverview Scan `~/.omp/agent/sessions/*/*.jsonl` for Past Sessions rows,
+ * the omp analog of what `scanProjectDir()` (session-routes.ts) does for
+ * Claude's own `~/.claude/projects` transcripts.
+ *
+ * Without this, an omp conversation exists ONLY as a Codeman-level live/
+ * persisted session record — delete that (a "Kill Tmux" close, or any other
+ * cleanup) and the conversation vanishes from Past Sessions entirely, even
+ * though `omp` itself never forgot it. Claude conversations don't have that
+ * problem because Codeman already reads them back from Claude's own
+ * transcript files independent of its own session bookkeeping; this gives
+ * omp conversations the same treatment.
+ *
+ * Each omp session file's SECOND line is a `{"type":"session","id":...,
+ * "cwd":...}` header carrying the real (unmangled) working directory and the
+ * session's own id directly — no need to reverse-engineer the mangled
+ * directory name the way Claude Code's own scanner has to (see
+ * `decodeProjectKey()` in session-routes.ts and its "lossy" caveat). Prompt
+ * text comes from each `{"type":"message","message":{"role":"user",...}}`
+ * entry, giving a real first-message title instead of a bare case name.
+ *
+ * Unlike Claude's transcripts (which can run to tens of MB of tool-call
+ * output), an omp session file is the conversation only, so this reads each
+ * file whole rather than doing head/tail windows — bounded by a size cap so
+ * one unexpectedly huge file can't blow up memory.
+ *
+ * @module omp-transcript
+ */
+
+import { readFileSync, readdirSync, statSync } from 'node:fs';
+import { homedir } from 'node:os';
+import { join } from 'node:path';
+
+function ompSessionsRoot(): string {
+  return join(homedir(), '.omp', 'agent', 'sessions');
+}
+
+/** Skip anything absurdly large rather than parsing it whole into memory. */
+const MAX_OMP_SESSION_FILE_BYTES = 2 * 1024 * 1024;
+
+/** Defensive cap on total files scanned across every directory, mirroring
+ *  the Claude scanner's own instinct not to let one pathological tree stall
+ *  a request — a real omp install has, at most, a few hundred of these. */
+const MAX_OMP_SESSION_FILES = 2000;
+
+export interface OmpHistorySession {
+  sessionId: string;
+  workingDir: string;
+  sizeBytes: number;
+  /** ISO timestamp, from the file's own mtime. */
+  lastModified: string;
+  firstPrompt?: string;
+  lastPrompt?: string;
+}
+
+function extractUserPromptText(message: unknown): string | undefined {
+  if (!message || typeof message !== 'object') return undefined;
+  const m = message as { role?: unknown; content?: unknown };
+  if (m.role !== 'user' || !Array.isArray(m.content)) return undefined;
+  const parts: string[] = [];
+  for (const block of m.content) {
+    if (block && typeof block === 'object' && (block as { type?: unknown }).type === 'text') {
+      const text = (block as { text?: unknown }).text;
+      if (typeof text === 'string') parts.push(text);
+    }
+  }
+  const joined = parts.join(' ').trim();
+  return joined || undefined;
+}
+
+/** Parse one omp session `.jsonl` file, or null when it's unreadable, empty, or has no session header. */
+function parseOmpSessionFile(filePath: string): OmpHistorySession | null {
+  let stat: ReturnType<typeof statSync>;
+  try {
+    stat = statSync(filePath);
+  } catch {
+    return null;
+  }
+  if (stat.size === 0 || stat.size > MAX_OMP_SESSION_FILE_BYTES) return null;
+
+  let raw: string;
+  try {
+    raw = readFileSync(filePath, 'utf-8');
+  } catch {
+    return null;
+  }
+
+  let sessionId: string | undefined;
+  let workingDir: string | undefined;
+  let firstPrompt: string | undefined;
+  let lastPrompt: string | undefined;
+
+  for (const line of raw.split('\n')) {
+    if (!line) continue;
+    let entry: unknown;
+    try {
+      entry = JSON.parse(line);
+    } catch {
+      continue;
+    }
+    if (!entry || typeof entry !== 'object') continue;
+    const e = entry as Record<string, unknown>;
+    if (e.type === 'session' && typeof e.id === 'string' && typeof e.cwd === 'string') {
+      sessionId = e.id;
+      workingDir = e.cwd;
+    } else if (e.type === 'message') {
+      const prompt = extractUserPromptText(e.message);
+      if (prompt) {
+        if (!firstPrompt) firstPrompt = prompt;
+        lastPrompt = prompt;
+      }
+    }
+  }
+
+  if (!sessionId || !workingDir) return null;
+  return {
+    sessionId,
+    workingDir,
+    sizeBytes: stat.size,
+    lastModified: stat.mtime.toISOString(),
+    firstPrompt,
+    lastPrompt,
+  };
+}
+
+/**
+ * Scan every omp conversation on disk into Past-Sessions rows. Best-effort
+ * throughout: a missing `~/.omp` (never installed/used), an unreadable
+ * directory, or one corrupt file yields fewer rows rather than throwing —
+ * this feeds the same unified merge the Claude transcript scanner does, and
+ * one broken source must never blank the whole Past Sessions list.
+ */
+export function scanOmpSessionsHistory(): OmpHistorySession[] {
+  const root = ompSessionsRoot();
+  let dirEntries: string[];
+  try {
+    dirEntries = readdirSync(root);
+  } catch {
+    return [];
+  }
+
+  const out: OmpHistorySession[] = [];
+  for (const dirName of dirEntries) {
+    if (out.length >= MAX_OMP_SESSION_FILES) break;
+    const dirPath = join(root, dirName);
+    let dirStat: ReturnType<typeof statSync>;
+    try {
+      dirStat = statSync(dirPath);
+    } catch {
+      continue;
+    }
+    if (!dirStat.isDirectory()) continue;
+
+    let files: string[];
+    try {
+      files = readdirSync(dirPath);
+    } catch {
+      continue;
+    }
+    for (const file of files) {
+      if (out.length >= MAX_OMP_SESSION_FILES) break;
+      if (!file.endsWith('.jsonl')) continue;
+      try {
+        const parsed = parseOmpSessionFile(join(dirPath, file));
+        if (parsed) out.push(parsed);
+      } catch {
+        // One bad file must not sink the whole scan.
+      }
+    }
+  }
+  return out;
+}